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The exact manual is hard to find. This might possible be near enough to be of some slight use:
A persistent paper jam message can be quite mysterious and annoying. I hope I can help with it.
One thing that is not always tried is:
- turn Off the fax machine, and unplug it from the power also.
- leave it that way for 15 minutes or longer, to cool off and reset thoroughly.
- only at the end of that time, plug it in again, turn it On, and see if the error is cleared.
This link seems to lead to a UX-1400 user manual from a fairly reputable source:
Try consulting that one, see if it reveals a way of examining the paper path for scraps of paper, even, that might well be triggering the jam message. All it takes, in my prolonged experience, is one small scrap of paper stuck in a sensor, for a machine to be jammed up and inoperative. (Tearing paper while removing it, is inadvisable for this reason.)